(;GM[1]FF[4]CA[UTF-8]AP[CGoban:2]ST[2] RU[Japanese]SZ[7]KM[0.50]TM[] AW[da][ab][bb][cb][db][cc][cd][fd][ce][ge][cf][ef][ff][cg][eg]AB[ea][eb][ac][bc][dc][ec][fc][bd][dd][be][de][ee][fe][bf][bg]C[No komi, no prisoners - Black to play and win!] (;B[gb]CR[gb] (;W[gd]CR[gd] (;B[df]CR[df] (;W[dg]CR[dg] ;B[fa]CR[fa]C[Black wins by one point! RIGHT]) (;W[fa]CR[fa] ;B[dg]CR[dg] ;W[ba]CR[ba] ;B[ed]CR[ed] ;W[fb]CR[fb] ;B[ga]CR[ga] ;W[fb]CR[fb] ;B[fa]CR[fa] ;W[gf]CR[gf] ;B[gg]CR[gg] ;W[fg]CR[fg]C[Black wins by four points!])) (;B[fa]CR[fa] ;W[df]CR[df]C[This is only a jigo - Black missed d2!])) (;W[df]CR[df] ;B[gd]CR[gd] ;W[gc]CR[gc] ;B[ed]CR[ed]C[Black wins big!]) (;W[fa]CR[fa] ;B[gd]CR[gd] ;W[gc]CR[gc] ;B[ed]CR[ed]C[Black wins big!])) (;B[gd]CR[gd] ;W[gc]CR[gc] ;B[gb]CR[gb] ;W[gd]CR[gd] (;B[df]CR[df] ;W[dg]CR[dg] (;B[fa]CR[fa]C[This is only a jigo - sacrificing a stone was bad!]) (;B[ed]CR[ed] ;W[gf]CR[gf] ;B[fa]CR[fa]C[This is only a jigo - sacrificing a stone was wrong])) (;B[fa]CR[fa] ;W[df]CR[df]C[WHITE wins by one point?! Sacrificibg a stone was wrong, and Black also missed the sente play d2])) (;B[df]CR[df] ;W[dg]CR[dg] (;B[gb]CR[gb] ;W[fa]CR[fa] ;B[gd]CR[gd] ;W[gc]CR[gc] (;B[gf]CR[gf] ;W[gg]CR[gg] ;B[gd]CR[gd] ;W[af]CR[af] (;B[ae]CR[ae] ;W[gc]CR[gc]C[Black has no more ko threat]) (;B[gf]CR[gf] ;W[ae]CR[ae]C[This is hopeless for Black])) (;B[ed]CR[ed] ;W[fb]CR[fb]C[ooops....])) (;B[gd]CR[gd] ;W[gc]CR[gc] (;B[gb]CR[gb] (;W[gd]CR[gd] (;B[fa]CR[fa]C[This is only a jigo, but Black had no choice - after playing d2, he must sacrifice a stone at g4]) (;B[ed]CR[ed] ;W[gf]CR[gf] ;B[fa]CR[fa]C[This is only a jigo])) (;W[fa]CR[fa] ;B[gd]CR[gd] ;W[af]CR[af] ;B[ae]CR[ae] ;W[gc]CR[gc] ;B[gf]CR[gf]C[This would be ok for Black, but White F9 was a mistake - g4 is better])) (;B[ed]CR[ed] ;W[gd]CR[gd]C[good enough for white - he can also fight the ko] ;B[gb]CR[gb] ;W[gf]CR[gf] ;B[fa]CR[fa]C[Jigo!])) (;B[gf]CR[gf] ;W[gd]CR[gd] (;B[ba]CR[ba] ;W[gg]CR[gg]C[White lives, Black is dead]) (;B[gg]CR[gg] ;W[ba]CR[ba]C[White lives, black is dead]))) (;B[gc]CR[gc] ;W[gd]CR[gd]C[Black is dead]) (;B[gf]CR[gf] ;W[gd]CR[gd] ;B[df]CR[df] ;W[dg]CR[dg] ;B[gg]CR[gg] ;W[ba]CR[ba]C[Black is dead]) (;B[ba]CR[ba]C[There is always a second white eye at the bottom]))